New CRT shader from Guest + CRT Guest Advanced updates

[Cyber]

@colourofsound

mask 7 on my LG BX OLED. I really like seeing the masks

If you want a mask that looks more like a real CRT’s Mask on your OLED TV, try the RRGGBBX (or XRRGGBB) Mask, Size 1 and use Mask Layout 1 (or whatever is the BGR mask layout in the Reshade port). Make sure your Desktop Resolution is 4K. On the slang version of CRT-Guest-Advanced Mask 12 is the RRGGBBX Mask, I’m not sure which one it is on the ReShade port.

[colourofsound]

Here we go. Looks pretty good! This is 100% mask strength too.

EDIT: it does however create red artefacts on colours like yellow and white; especially on text. If I change the layout to RGB it’s mitigates it somewhat; but not entirely. Mask 9 doesn’t have it at all as a means of comparison. I took a picture but it doesn’t really show on my phone. My LG has BGRW; it’s one of the less straight forward ones…I am finding that you need to tailor settings per game!

FYI all settings in Reshade are the same, except in situations where you’d have negative values. So in a case where in Retroarch values would go from -10 to 10; in Reshade they’d go 0 to 20.

So in this instance, the parameters you mention are the same.

[colourofsound]

@guest.r

HD version can be least intensive, if you stretch the filter range like with Internal Resolution, then things become slower.

Yeah I’m seeing this behaviour in Reshade. So you can get the same look by setting Reshades preprocessor resolution to whatever the game is running at (which usually almost completely removes the effect) and then use the downsample internal resolution setting - or, just set Reshades resolution to the equivalent resolution of what the down sampling does. Exact same effect; but the shader isn’t having to do any work and you maintain FPS

[Cyber]

@colourofsound

My LG has BGRW

As far as I know all LG WOLED TVs use an RWBG layout until the G5. Are you sure it’s BGRW? Also, I don’t think CRT-Guest-Advanced’s BGR layout actually starts on Red. It’s actually RBG but of course individual Mask Layouts could vary.

You can take a look at these threads and posts if you want to dig deeper into the topic:

New CRT shader from Guest + CRT Guest Advanced updates

Yeah I noticed that too! I’m using an LG C1. But as you said, it’s not visible from a normal viewing distance, and the added brightness is always welcomed. No need to compensate as much. Make sure you ping us when you add them. I want to check them out!

New CRT shader from Guest + CRT Guest Advanced updates

I think the real advantage is that the triads simply look more like triads using Mask 12 on an OLED TV. Besides the seemingly unavoidable extra black vertical line, what really kills the effect for me is the almost overlapping appearance between the rightmost blue subpixel stripe and the leftmost red subpixel stripe. It makes the blue subpixel appear a bit undernourished compared to the red and green ones. The improved separation created by Mask 12 allows the Blue subpixel to finally flex its …

New CRT shader from Guest + CRT Guest Advanced updates

That would not be possible. Mask 12 uses 2 pixels for each column, so that rules out any TV processing or subpixel arrangement. Also, look at this screenshot: [image] It’s clear the shader is producing RBG triads instead of BGR. Is there a reason for this @guest.r ?

New CRT shader from Guest + CRT Guest Advanced updates

It starts with red due to implementation. BGR is otherwise just a naming, there aren’t set ruls which color is the ‘first’ in row. Otherwise the layout is not to be changed to BGR if you use a RGB panel. The ‘last’ black pixel is there to ensure better subpixel spacing.

OLED subpixels. How do they work?

Right, so it should fetch a higher resale value if you sell it to buy that new TV! Lol I could be wrong but weren’t older (or at least some) LG OLED panels WOLED with WRGB layout with all white OLEDs in the back layer shining through an RGB filter as described here? If so, then one of those models might be a nice alternative except that they most definitely won’t have 120hz input and BFI. What’s the difference between RGB, RGBW, and WRGB pixels? This explains something @Nesguy has been say…

New CRT shader from Guest + CRT Guest Advanced updates

You know many of these topics, ideas and concepts, discussed in the videos were actually pioneered right here on Libretro Forums, with very little fanfare. One only has to browse this thread, the Sony Megatron Colour Video Monitor thread, many of @Nesguy’s threads, the CyberLab Death To Pixels Shader Presets thread, the OLED Subpixels: How do they work thread and @HunterK’s Filthy Pants blog and you’ll see what I’m referring to.

Summary

Major developments in CRT Shader support for OLED and HD…

Lastly for some photo tips:

Be sure your camera is stable. Use Pro/manual mode. Speed 1/60 or 1/30. ISO 100-400. WB 4000K - 5000K or Auto. Focus Manual or Auto.

[colourofsound]

According RTINGS it’s RGBW but all 4 are never on at the same time. However the images they have of the sub pixels are confusing; they look like WBGR to me but also I can see a dark green sub-pixel and a fluorescent green sub-pixel; so I have no idea what I’m looking for, probably

[Cyber]

@colourofsound

According RTINGS it’s RGBW

OLED subpixels. How do they work?

New Subpixel Layout/Order confirmed for 2025 LG Display RGB Tandem OLED display panels. Might also apply to other RGB Tandem OLED displays already on the market. LG also changed the subpixel layout. Instead of the RWBG layout they’ve been using since they first introduced their OLED panels, the G5 is different. It looks to be an RGBW layout, but the first subpixel is blue, so we’re classifying it as a BWRG layout. If you want to see a closer look at this new subpixel arrangement, we took a vide…

OLED subpixels. How do they work?

I don’t have answers to your questions, I just wanted to point out that, as far as I know, this is the third subpixel layout from LG. The RWBG layout they’ve been using in their TV panels. (And some older monitor panels?) The RGWB layout in some of the new monitor panels. Now this BWRG layout in the G5 panel. They are supposedly working on RGB (no white) layout panels for future monitors (source here, all the way at the bottom). Is this summary missing anything?

Sony Megatron Colour Video Monitor

Thanks! Ok so they’re WBGR i.e reversed RGBW which now explains why we’re seeing the reverse patterns look better. I’ll update the above patterns and see where we get to but I’m guessing it’ll be XBBGGRR is best then RRGGBB as that’s the opposite layouts of the results above. EDIT: I’ll stick with RTings image of starting with Red i.e RWBG but it shouldnt make any difference to the spacing as it’s just starting in the reversed pattern in a different position.

Sony Megatron Colour Video Monitor

So I’ve just written out that layout below using RWBG and it does look like the above mask - apologies @Cyber - I can see that gap between the red and blue now. Fair enough. RRBBGGX RxxxRxxxxxBxxxBxxxxGxxxGxxxx XBBGGRR: xxxxxxBxxxBxxxxGxxxGRxxxRxxx RRGGBBX: RxxxRxxxxxxGxxxGxxBxxxBxxxxx

[Jobima]

@guest.r I’ve had this in mind for a long time

why not using “scale_x6 = 0.25”? or “scale_x7 = 0.50” if “scale_x6 = 0.50” need to be like this

I asked this because, based on my limited knowledge of shaders, the video will be enlarged to double size horizontally, which might require more processing power

[guest.r]

This was an option indeed some years ago, but users kept using the 2x scaling option, since it was still available.

Default scaling options also allow better scanline dynamics and artifacting/fringing manifestation. Pixel transition would also be compromised to a degree with the actual LPF…

I guess it’s needles to say what the original standard NTSC resolution is, this all is accounted into ntsc-adaptive pass scaling.

There aren’t too many passes which would benefit from a speedup, it’s not worth to sacrifice quality.

TL;DR current implementation brings better quality regarding the whole ntsc composition.

[Jobima]

@guest.r

TL;DR current implementation brings better quality regarding the whole ntsc composition.

I did play with it and yes I get less quality/sharping

@guest.r

There aren’t too many passes which would benefit from a speedup, it’s not worth to sacrifice quality.

well I was looking for a way to get some speedups since I cant use crt-black_crush-koko with 4x resolution (seems it will eat all the VRAM), and this speedup seem make it work but as you said it will do “sacrifice quality.”